Gout

Sometimes joints get very sore.

They can look red, hot, and swollen. This often happens at the big toe.

This pain comes from tiny crystals. These crystals look like small needles. They build up in the joints. This happens when too much acid stays in the blood.

Certain foods can cause this. Eating things like shellfish can help. Drinking beer can also be a reason.

Hard bumps can grow under the skin. These are called tophi. They can also form in the kidneys.

Doctors can help people feel better. Eating low-fat dairy might help too. It is good to stay healthy.

Gout is a type of joint pain.

It makes a joint feel red, hot, and swollen. The pain often starts very fast. It can reach its worst point in less than 12 hours. This often happens at the base of the big toe. This specific pain is called podagra.

Gout happens because of uric acid. This is a substance found in the blood. When there is too much uric acid, it forms crystals. These crystals look like tiny needles. They settle in joints, tendons, and other parts of the body.

Many things can lead to high uric acid. Some people have genes that make it more likely. Diet also matters. Eating foods like shellfish or liver can raise levels. Drinking beer or sugary drinks can also help cause it.

Over time, these crystals can form hard bumps. These bumps are called tophi.

Doctors can help manage the pain. They may use certain medicines. People can also make healthy changes. Eating low-fat dairy or taking vitamin C might help prevent attacks. Staying at a healthy weight is also good for the body.

Gout is a type of arthritis that causes sudden, painful attacks.

These attacks make a joint feel red, hot, and swollen. The pain usually comes on very fast. It can reach its worst point in less than 12 hours. About half of all cases happen at the base of the big toe. This specific pain in the toe is called podagra. Gout can also affect the heels, knees, wrists, or fingers. It is a condition that affects about 1% to 2% of adults in the developed world.

This condition works because of how the body handles uric acid. Uric acid is a substance made when the body breaks down purines. Usually, the kidneys remove this acid from the blood. In 90% of cases, gout happens because the kidneys do not get rid of enough uric acid. This leads to hyperuricemia, which means having high levels of uric acid in the blood.

When levels are high, the acid turns into tiny, needle-shaped crystals. These crystals settle into joints, tendons, and other tissues. This causes the body to react with inflammation.

History shows that people have known about gout for a very long time. It has been recognized since the time of the ancient Egyptians. In the past, it was often called "the disease of kings." It was also known as "rich man's disease." This was because certain foods and drinks linked to gout were expensive. Today, gout has become more common in recent decades. This might be due to changes in diet and longer life expectancy.

Many factors can change how much uric acid a person has. Diet plays a role in about 12% of cases. Foods high in purines, like liver, shellfish, or anchovies, can raise levels. Drinking beer or drinks with lots of sugar also increases risk. Genetics are also important and account for about 60% of the differences in uric acid levels. Some people have specific genes, like SLC2A9, that can double their risk. Being overweight or having metabolic syndrome also makes gout more likely.

If crystals stay in the body for a long time, they can form hard bumps. These bumps are called tophi.

Tophi can appear on joints or even on the ears. If they get very large, they might cause bone erosion. Doctors can find these crystals by looking at joint fluid under a microscope. To help prevent attacks, people can make healthy lifestyle changes. Eating low-fat dairy or taking vitamin C may help. Staying at a healthy weight is also a good way to manage the risk.

Gout is a specific form of inflammatory arthritis. It is characterized by sudden, recurrent attacks of intense pain. These attacks cause joints to become red, tender, hot, and swollen.

This condition is a disorder of purine metabolism. It occurs when the body's final metabolite, uric acid, crystallizes into monosodium urate. These crystals then deposit in joints, tendons, and surrounding tissues. Gout affects approximately 1% to 2% of adults in the developed world. It has become more common in recent decades due to changes in diet and longer life expectancy.

The underlying cause of gout is hyperuricemia. This term describes persistently elevated levels of uric acid in the blood. In about 90% of cases, hyperuricemia is caused by the underexcretion of urate by the kidneys. In less than 10% of cases, the condition results from the overproduction of uric acid.

When uric acid levels reach a certain threshold, the substance begins to crystallize. These needle-shaped crystals precipitate into the body's tissues. This process is often triggered by factors like cool temperatures or rapid changes in uric acid levels. For example, lower body temperatures at night may explain why joint pain often begins during the night.

Once the crystals deposit, they trigger a complex biological mechanism. If the crystals are part of a walled-off deposit, they may not cause immediate trouble. However, if naked crystals break out due to physical trauma or surgery, they trigger an immune response. This reaction involves macrophages, which are specialized cells in the immune system. The process is initiated by a protein complex called the NLRP3 inflammasome. This complex activates the enzyme caspase 1. This enzyme then converts pro-interleukin 1β into active interleukin 1β. This protein is a key part of the inflammatory cascade that causes the painful swelling.

Gout can manifest in several distinct ways and locations. The most common presentation is an acute attack of inflammatory arthritis. About half of all cases involve the metatarsophalangeal joint at the base of the big toe. This specific condition is known as podagra.

Gout can also affect midfoot structures like the cuneiform bones. Other joints, including the heels, knees, wrists, and fingers, may be involved. Long-standing hyperuricemia can lead to the formation of tophi. Tophi are hard, often painless deposits of uric acid crystals.

Extensive tophi can eventually lead to chronic arthritis and bone erosion.

Beyond the joints, high uric acid levels can impact other systems. Crystals may precipitate in the kidneys, leading to the formation of kidney stones. This can result in acute uric acid nephropathy, which is kidney damage. The history of gout is quite long, dating back to at least the time of the ancient Egyptians. Because it was often linked to the consumption of expensive foods, it was historically called "the disease of kings" or "rich man's disease."

Many factors influence the risk of developing gout. Dietary choices account for about 12% of cases. Foods high in purines, such as liver, shellfish, anchovies, and dried mushrooms, increase risk. Alcohol consumption, especially beer and spirits, is also strongly associated with the condition. Genetics play a massive role, contributing to about 60% of the variability in uric acid levels. Specific genes like SLC2A9, SLC22A12, and ABCG2 are commonly associated with the disorder. Additionally, metabolic syndrome occurs in nearly 75% of gout cases. This syndrome includes abdominal obesity, hypertension, and insulin resistance.

Doctors use several methods to diagnose gout and manage its symptoms. A definitive diagnosis is made by identifying monosodium urate crystals in synovial fluid. This fluid is collected through a process called arthrocentesis. Under polarized light microscopy, these crystals show a needle-like shape. While blood tests can show hyperuricemia, they are not always reliable during an active attack. Treatment focuses on reducing inflammation and lowering uric acid levels. Nonsteroidal anti-inflammatory drugs (NSAIDs), glucocorticoids, or colchicine are used to improve acute symptoms. For long-term prevention, medications like allopurinol or probenecid may be prescribed.